JP2012013047A - Filter for fuel supply port of fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for the fuel supply port of a fuel injection valve, which suppresses the cost of manufacturing, prevents contaminant from intruding into a fuel injection valve, and can be firmly attached to the fuel supply port without being affected by a weld line formed during molding a filter.SOLUTION: The filter 10 comprises a support member 20 comprising a resin molded article and a cylindrical mesh member 40 supported by the support member. The support member 20 comprises a body 22, a flange 24, a plurality of columns 26 and a bottom 28. The flange 24 includes a wall 32, a blanked hole 34 formed on the inner circumference of the wall 32, and an engaging pawl 36 formed inside the wall 32, approximately matched with the blanked hole 34 along an axial direction. A weld line formed during injection molding of the support member 20 is not present on an circumferential edge of the blanked hole 34.

Description

  The present invention relates to a fuel supply port filter for a fuel injection valve, which is disposed at a fuel supply port of a fuel injection valve and filters fuel flowing into the fuel injection valve.

  A fuel injection valve (also referred to as an “injector”) that injects fuel is provided with a filter for removing foreign matters in the fuel. This filter is normally disposed at the fuel supply port of the fuel injection valve, and filters the fuel flowing into the fuel injection valve.

  The following Patent Document 1 describes an electromagnetic fuel injection valve, and a cylindrical filter is attached to the fuel supply port. The filter has a filter body made of synthetic resin, and a mesh member (filter net) is supported by the filter body. Further, an outer flange portion is formed toward the outer diameter direction from the base end of the filter body.

  Furthermore, a metallic reinforcing collar including a small cylindrical portion and an inner flange portion extending from the outer periphery of the base end thereof is joined to the filter body by insert molding. The small cylindrical portion of the collar is disposed on the outer periphery of the base portion of the filter body, and the inner flange portion is disposed on the back surface side of the outer flange portion.

  Then, the filter main body is inserted into the fuel supply port of the fuel injection valve, the small cylindrical portion of the metal reinforcement collar is press-fitted into the inner periphery of the cylinder of the fuel injection valve, and the metal reinforcement collar is inserted into the end surface of the fuel supply port. A filter is attached to the fuel supply port by abutting the inner flange portion.

  In addition, the filter is attached to the fuel supply port as follows. That is, as a filter, a cylindrical portion made of a synthetic resin that supports the mesh and a flange portion that abuts the end surface of the fuel supply port are provided, and a wall portion is erected from the flange portion, and the filter is engaged inside the wall portion. Make the claws project. Then, by inserting the cylindrical portion of the filter into the fuel supply port, bringing the flange portion into contact with the end surface of the fuel supply port, and engaging the engagement claw with the engagement portion formed on the outer periphery of the fuel supply port The filter is attached to the fuel supply port. The filter can be manufactured, for example, by setting a cylindrical mesh in a mold and then injecting resin into the cavity.

JP 2010-31674 A

  In the fuel injection valve described in Patent Document 1, the filter is attached to the fuel supply port by press-fitting the metal reinforcing collar of the filter body into the inner periphery of the cylinder of the fuel injection valve. However, in the fuel injection valve, it is necessary to prepare a metal reinforcing collar separately, and the metal reinforcing collar is more expensive than a synthetic resin filter body, which increases the manufacturing cost of the entire filter. Inconvenience arises.

  Further, when the metal reinforcing collar is press-fitted, the inner periphery may be scraped depending on the material of the fuel injection valve. As a result, shavings enter the fuel injection valve as so-called contamination, which is a problem.

  In addition, in the case of the filter provided with the above-described engaging claw, the flange portion may be damaged when the engaging claw is engaged with the engaging portion on the outer periphery of the fuel supply port depending on the weld line generated during filter forming. There is.

  For example, if a weld line exists at a position aligned with the engaging claw of the flange portion, the weld line is formed at a portion aligned with the engaging claw of the flange portion when the wall portion provided with the engaging claw bends and deforms. In some cases, the flange portion was damaged due to cracks. In this case, there is a demerit that the filter cannot be firmly attached to the fuel supply port.

  Therefore, the object of the present invention is to reduce the manufacturing cost, prevent contamination from entering the fuel injection valve, and firmly attach to the fuel supply port without being affected by the weld line generated during molding. Another object of the present invention is to provide a fuel supply port filter for a fuel injection valve.

  In order to achieve the above object, the present invention provides a filter that is disposed in a fuel supply port of a fuel injection valve and that filters fuel that passes through the fuel supply port, comprising a support member made of a resin injection-molded product, A cylindrical mesh member supported by a support member, the support member extending outward from one end surface of the cylindrical main body portion and the main body portion, and contacting the end surface of the fuel supply port It has a flange part, a plurality of pillar parts extended from the other end face of the body part, and a bottom part which connects the pillar parts, and the flange part extended from the back side toward the bottom part. A wall portion, a through hole formed in the inner periphery of the base portion of the wall portion and penetrating the flange portion, and formed on the inner side of the wall portion so as to be substantially axially aligned with the hole. An engaging claw that engages with an engaging portion provided on the outer periphery of the supply port. The shoe member has one end connected to the body portion and the other end connected to the bottom portion, and is supported by the support member. A weld line formed during injection molding of the support member is connected to the flange portion. It does not exist at the peripheral edge of the punched hole.

  In the present invention, the “periphery portion of the punched hole” means a wall portion surrounding the punched hole.

  In this invention, the said pillar part is each extended from the two places which oppose the circumferential direction of the said main-body part, and the said punch hole is 40 to the circumferential direction from the said pillar part with respect to the center of the said main-body part. It is preferable that the gap is formed within a range of 50 °.

  According to the present invention, the supporting portion of the mesh member of the filter is inserted into the fuel supply port of the fuel injection valve, the flange portion is brought into contact with the end surface of the fuel supply port, and the engaging claw is disposed on the outer periphery of the fuel supply port. By engaging with the engaging portion, the filter can be attached to the fuel supply port. In this way, the filter can be attached to the fuel supply port without using a separate metal collar, so the manufacturing cost of the filter can be reduced. In addition, since it is not necessary to press-fit the metal collar into the cylinder of the fuel supply port, shavings are not generated and so-called contamination can be prevented from entering the fuel injection valve.

  Furthermore, since the weld line generated when the support member is molded does not exist in the peripheral edge portion of the hole of the flange portion, in order to engage the engaging claw with the engaging portion on the outer periphery of the fuel supply port, When the wall provided with the engaging claw is bent and deformed, cracks due to weld lines are less likely to occur in the flange, and the rigidity of the flange is maintained, and the filter is firmly attached to the fuel supply port Can do.

  In addition, since the engaging claw is formed at a position aligned with the punched hole of the flange portion in the axial direction, the shape of the engaging claw is formed using the punched hole when the support member is formed. The mold can be slid and removed, preventing the mold from being forcibly removed as conventionally done, the wear of the mold can be suppressed, and the engaging claw can be reliably molded, The engagement claw of the engagement claw with respect to the engagement portion provided on the outer periphery of the fuel supply port can be made large.

  Further, by providing a hole corresponding to the engaging claw in the flat surface portion of the flange portion, the wall portion located in the vicinity of the hole can be easily bent. It becomes easy to engage the engaging claw.

It is a perspective view which shows one Embodiment of the filter for fuel supply ports of the fuel injection valve which concerns on this invention. FIG. 2 is a perspective view when the filter is viewed from a direction different from that in FIG. 1. It is a principal part expansion perspective view of the filter. It is sectional drawing in the AA arrow line of FIG. (A) is a top view of the filter, and (B) is a cross-sectional view taken along the line B-B in (A). It is explanatory drawing which shows the metal mold | die for the said filter shaping | molding. It is explanatory drawing of the state which mounted | wore the fuel supply port of the fuel injection valve with the same filter.

  Hereinafter, an embodiment of a filter for a fuel supply port of a fuel injection valve according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 7, a fuel supply port filter 10 (hereinafter referred to as “filter 10”) of the fuel injection valve is disposed at a fuel supply port 3 (see FIG. 7) of the fuel injection valve 1. It is for filtering the fuel which passes the fuel supply port 3, Comprising: The supporting member 20 which consists of an injection molding product of resin, and the cylindrical mesh member 40 supported by this supporting member 20 are provided. . The fuel injection valve 1 is well known and will not be described in detail. However, a base end opening of a cylindrical fuel pipe 2 forms the fuel supply port 3, and an annular protrusion is formed on the outer periphery of the fuel supply port 3. An engaging portion 5 having a shape is formed. A cylindrical cover 6 is disposed on the outer periphery of the fuel pipe 2, and the tip thereof forms a portion that supports the O-ring 8. Furthermore, a connection pipe 7 to a fuel supply pipe (not shown) is externally provided on the outer periphery of the cylindrical cover 6.

  Referring to FIGS. 2 to 5 and 7 together, the support member 20 has a cylindrical shape and a main body portion 22 (see FIGS. 2 and 7) inserted into the fuel supply port 3, and the main body portion 22. An annular flange portion 24 extending outward from one end surface of the main body 22 and contacting the end surface of the fuel supply port 3, a plurality of column portions 26 extending from the other end surface of the main body portion 22, and the column portions And a disk-shaped bottom portion 28 to which the H.26 is connected. The mesh member 40 is supported by the support member 20 with one end connected to the main body portion 22 and the other end connected to the bottom portion 28.

  The column part 26 in this embodiment is the other end surface of the main body part 22 and is composed of a pair of parts extending from two locations facing each other in the circumferential direction (see FIG. 2).

  As shown in FIGS. 2 to 5, the wall portion 32 of the flange portion 24 extends from the back surface side toward the bottom portion 28. In this embodiment, a plurality of (four in this case) wall portions having a protruding piece shape from the substantially radial center of the flange portion 24 with a uniform interval along the circumferential direction of the flange portion 24. 32 extends with a predetermined width. In addition, the wall part 32 may be mutually connected and may comprise the cylinder shape as a whole.

  As shown in FIGS. 1 to 3 and FIGS. 5A and 5B, the flange portion 24 is formed with a through hole 34 penetrating the flange portion 24 on the inner periphery of the base portion of the wall portion 32. The through holes 34 in this embodiment are formed at equal intervals along the circumferential direction of the flange portion 24 and with a slightly smaller width than the wall portion 32, corresponding to the four wall portions 32 described above. (See FIG. 5A). Both end portions in the width direction of each punched hole 34 have a circular arc shape (see FIGS. 1 and 5A).

  As shown in FIG. 5A, the hole 34 is formed so as to be shifted from the column part 26 in the circumferential direction within a range of a predetermined angle θ with respect to the center C of the main body part 22. This angle θ is preferably in the range of 40 to 50 °, more preferably in the range of 43 to 47 °. In this embodiment, the hole 34 is formed with a 45 ° angle shift from the column portion 26 in the circumferential direction with respect to the center C of the main body portion 22, and as described above, in the circumferential direction of the flange portion 24. A total of four are formed at equal intervals. Moreover, it is comprised in the peripheral part of each punch hole 34 so that the weld line W (refer FIG. 5 (A)) produced at the time of the injection molding of the support member 20 does not exist.

  As shown in FIGS. 2 and 5A, the engaging portion 5 on the outer periphery of the fuel supply port 3 is located at a position substantially aligned with the punched hole 34 in the axial direction and inside the wall portion 32. An engaging claw 36 is formed to engage the. In this embodiment, the engaging claws 36 are respectively formed inside the four wall portions 32 corresponding to the four holes 34 formed in the flange portion 24. As shown in FIGS. 2 and 3, each engaging claw 36 has a width substantially corresponding to the width along the circumferential direction of the punched hole 34 and has a slightly curved shape along the inner circumference of each wall portion 32. There is no.

  As shown in FIG. 4, the inner surface (on the flange portion 24 side) of the engaging claw 36 forms an engaging step portion 36 a that is gradually inclined toward the radially inner side of the flange portion 24. The engagement step portion 36a is a portion that engages with the engagement portion 5 of the fuel injection valve 1 (see FIG. 7). Further, the outer surface (on the side of the bottom portion 28) of the engaging claw 36 forms a tapered surface 36b that is gradually inclined inward in the radial direction of the flange portion 24, and enters the fuel supply port 3 of the fuel injection valve 1. Insertability is improved.

  In this embodiment, two column parts 26 are provided, and four wall parts 32, four punch holes 34, and four engaging claws 36 aligned therewith are provided. However, the number is not limited to these. Can be provided as appropriate. Further, the wall portion 32 may have a cylindrical shape extending from the rear surface of the flange portion 24.

  Next, a method for forming the filter 10 having the above structure will be described. The filter 10 can be injection-molded using, for example, a mold as shown in FIG.

  The mold 50 includes a first mold 52 that mainly molds the outer shape of the wall portion 32, the engaging claw 36, the main body portion 22, the column portion 26, the bottom portion 28, and the like, the outer shape of the flange portion 24, and the hole 34. And a second mold 54 that mainly molds the inner shape of the main body portion 22, the column portion 26, the bottom portion 28, and the like. These molds 52 and 54 can be moved close to and away from each other. The second mold 54 is formed with four projecting pieces 54a for forming the hole 34. Further, the first mold 52 has a protrusion 52a that is disposed between the main body portion 22 and the wall portion 32, forms the outer shape of the engaging claw 36, and supports the protruding piece 54a. Is provided.

  And after setting the cylindrical mesh member 40 in the 1st type | mold 52, both mold | types 52 and 54 are closed and molten resin is inject | poured in the formed cavity. In this embodiment, an injection gate is arranged at the center of the cavity for molding the bottom portion 28, and a pair of column portions 26 and 26 are connected to the bottom portion 28 so as to face each other, so as shown by an arrow M1 in FIG. The molten resin flows from the gate into the cavity for molding the bottom portion 28, and the molten resin branches and flows into the cavities for molding the column portions 26 and 26 (see arrows M2 and M2), respectively. It flows into the cavity.

  As indicated by arrows M3 and M4 in FIG. 5, the molten resin that has passed through the cavity for molding the main body portion 22 flows in the cavity for molding the flange portion 24, and for molding the wall portion 32 and the engaging claw 36. Go to the cavity. At this time, the melted resin branched through the cavity for forming the column parts 26 and 26 arranged oppositely flows along the circumferential direction of the cavity for molding the flange part 24, as shown in FIG. When the resin is solidified in the portion between the holes 34 and 34 and separated from the column portions 26 and 26 by approximately 90 ° and the resin is solidified in this state, an irregular weld line W is generated in the merged portion. (See phantom line in FIG. 5B).

  When the molten resin is cooled and solidified, the mesh member 40 is fixed to the outside of the column portion 26, and one end thereof is connected to the main body portion 22 and the other end is connected to the bottom portion 28 to be supported by the support member 20. Is done. Thus, the filter 10 is injection-molded in a state where the support member 20 and the mesh member 40 are integrated. Then, the filter 10 can be taken out from the mold 50 by sliding both molds 52 and 54 in a direction away from each other and opening the first mold 52 and the second mold 54.

  At this time, in the filter 10, since the engaging claw 36 is formed at a position aligned with the punched hole 34 of the flange portion 24 in the axial direction, the projecting piece 54 a for forming the punched hole 34 is used. Thus, the engaging step 36 a at the upper end of the engaging claw 36 can be formed, and the outer shape of the engaging claw 36 can be formed by the protrusion 52 a provided on the first mold 52.

  That is, the structure of forming the engagement claw 36 only by the protrusion 52a entering between the main body 22 and the wall 32 is not adopted, and the engagement claw 36 is formed by both the protrusion 52a and the protrusion 54a. Therefore, both the molds 52 and 54 can be smoothly removed without forcibly removing the engaging claw 36, and the engaging claw 36 can be reliably formed with high dimensional accuracy.

  Further, since the size of the engaging step portion 36a of the engaging claw 36 can be set as appropriate simply by adjusting the dimensions of the protruding portion 52a and the protruding piece 54a, a large engagement margin of the engaging claw 36 is ensured. You can also Further, since the first mold 52 and the second mold 54 are not forcibly removed, for example, even when glass fiber or the like is added to the molten resin, the wear of the mold 50 is effectively suppressed. The lifetime can be maintained for a long time.

  When the filter 10 is attached to the fuel supply port 3 of the fuel injection valve 1, it is performed as follows. That is, the support portion of the mesh member 40 of the filter 10 is inserted into the fuel supply port 3 of the fuel injection valve 1 and pushed in until the flange portion 24 abuts against the end surface of the fuel supply port 3. Then, the tapered surface 36b of the engaging claw 36 is pressed against the engaging portion 5 on the outer periphery of the fuel supply port 3, the wall portion 32 bends outward, and when the engaging claw 36 gets over the engaging portion 5, the wall portion 32 is elastically restored, the engaging step portion 36a of the engaging claw 36 is engaged with the engaging portion 5, and the flange portion 24 is brought into contact with the end surface of the fuel supply port 3, as shown in FIG. A filter 10 can be attached to the fuel supply port 3.

  Thereafter, the O-ring 8 is fitted into a groove defined by the lower end of the flange portion 24, the outer periphery of the wall portion 32, and the upper end of the cylindrical cover 6, and a connection pipe 7 of a fuel supply pipe (not shown) is provided on the outer periphery of the fuel injection valve 1. By mounting, the O-ring 8 is appropriately compressed, and the sealing performance between the connecting pipe 7 and the fuel injection valve 1 is maintained (see FIG. 7).

  According to the filter 10, the support portion of the mesh member 40 is inserted into the fuel supply port 3, the flange portion 24 is brought into contact with the end surface of the fuel supply port 3, and the engaging claw 36 is connected to the fuel supply port. The filter 10 can be attached to the fuel supply port 3 with a relatively simple structure of engaging with the engaging portion 5 on the outer periphery.

  That is, unlike the electromagnetic fuel injection valve described in Patent Document 1, the filter 10 can be attached to the fuel supply port 3 without using a separate metal collar, thereby reducing the manufacturing cost of the filter 10. can do. Moreover, since it is not necessary to press-fit the metal collar into the cylinder of the fuel supply port, shavings are not generated, and so-called contamination can be reliably prevented from entering the fuel injection valve.

  In addition, when the filter is attached to the fuel supply port 3, in the filter 10, the flange portion 24 is formed with the hole 34 corresponding to the engaging claw 36, and thus extends from the outer peripheral edge of the hole 34. The protruding wall portion 32 is easily bent, and the engaging claw 36 can be easily engaged with the engaging portion 5 at the periphery of the fuel supply port 3.

  Further, in this filter 10, the weld line W generated at the time of injection molding is formed so as not to exist in the peripheral edge portion of the punched hole 34 of the flange portion 24 (see FIG. 5A). When the engaging claw 36 is engaged with the engaging portion 5 on the outer periphery of the fuel supply port 3, the wall portion 32 extending from the flange portion 24 and provided with the engaging claw 36 inside thereof is bent and deformed. Even if the bending stress from the wall portion 34 acts on the flange portion 24, the flange portion 24 is less likely to be cracked due to the weld line W. As a result, it is possible to firmly attach the filter 10 to the fuel supply port 3 while maintaining the rigidity of the flange portion 24.

  Further, as shown in FIG. 5 (A), the column portions 26 and 26 are respectively extended from two locations facing the circumferential direction of the main body portion 22 so that the weld line W at the time of injection molding is separated from the column portion. Therefore, it is possible to make it at a location approximately 90 ° apart. In this embodiment, since the punch hole 34 is formed by being shifted in the range of 40 to 50 ° in the circumferential direction with respect to the column portion 26, the weld line W is formed on the periphery of the punch hole 34. It can be surely prevented.

  Further, during the injection molding of the filter 10, the molten resin smoothly flows into the cavity for molding the flange portion 24 through the cavity for molding the column portion 26 (see FIG. 5: arrow M3) and for molding the hole 34. As shown by an arrow M4 in FIG. 5, the projection 54a is smoothly wound around the projection piece 54a. As a result, the molten resins join together at a high temperature, so that the bondability between the resins can be improved, and cracks can be made more difficult to occur.

DESCRIPTION OF SYMBOLS 1 Fuel injection valve 3 Fuel supply port 5 Engagement part 10 Fuel supply port filter (filter)
20 Support member 22 Body portion 24 Flange portion 26 Column portion 28 Bottom portion 32 Wall portion 34 Punch hole 36 Engaging claw 40 Mesh member W Weld line

Claims (2)

A filter disposed at a fuel supply port of a fuel injection valve for filtering fuel passing through the fuel supply port;
A support member made of an injection molded product of resin, and a cylindrical mesh member supported by the support member;
The support member has a cylindrical main body, a flange that extends outward from one end surface of the main body, abuts against an end surface of the fuel supply port, and extends from the other end of the main body. Having a plurality of pillars and a bottom connecting the pillars;
The flange portion includes a wall portion extending from the back side toward the bottom portion, a punch hole formed in the base portion inner periphery of the wall portion, and penetrating the flange portion, and an axis with respect to the punch hole. An engagement claw that is formed on the inner side of the wall portion substantially aligned with the direction and engages with an engagement portion provided on the outer periphery of the fuel supply port,
The mesh member has one end connected to the main body and the other end connected to the bottom, and is supported by the support member.
A fuel supply port filter for a fuel injection valve, wherein a weld line formed at the time of injection molding of the support member does not exist in a peripheral portion of the punched hole of the flange portion. Each of the pillars extends from two locations facing the circumferential direction of the main body,
2. The filter for a fuel supply port of a fuel injection valve according to claim 1, wherein the through hole is formed so as to be shifted from the column portion in the circumferential direction by 40 to 50 ° with respect to the center of the main body portion.